Piping; Electrical - Bosch EP Series Installation And Maintenance Manual

8 | Piping

The return air inlet to the heat pump must have at
least one 90 degree turn away from the space
return air grille.
If air noise or excessive air flow are a problem, the
blower speed can be changed to a lower speed to
reduce air flow.
(Refer to ECM motor interface board section in
Figure#11)
PIPING
Supply and return piping must be as large as the
unit connections on the heat pump (larger on long
runs).
NOTE: Never use flexible hoses of a smaller
inside diameter than that of the fluid
connections on the unit.
EP units are supplied with either a copper or
optional cupro-nickel condenser. Copper is
adequate for ground water that is not high in
mineral content.
NOTE: Proper testing is recommended to
assure the well water quality is suitable for use
with water source equipment.
In conditions anticipating moderate scale
formation or in brackish water a cupro-nickel heat
exchanger is recommended.
NOTE: Both the supply and discharge water
lines will sweat if subjected to low water
temperature. These lines should be insulated to
prevent damage from condensation.
All manual flow valves used in the system must be
ball valves. Globe and gate valves must not be used
due to high pressure drop and poor throttling
characteristics.
NOTE: Never exceed the recommended
water flow rates as serious damage or
erosion of the water-to-refrigerant heat
exchanger could occur.
Always check carefully for water leaks and repair
appropriately. Units are equipped with female pipe
thread fittings. Consult Unit Dimensional
Drawings. (Pg#33 through Pg#34)
NOTE: Teflon tape sealer should be used when
connecting water piping connections to the units
to insure against leaks and possible heat
exchanger fouling.
8733953041 (2019/01)
NOTE: Do not overtighten the connections.
Flexible hoses should be used between the unit
and the rigid system to avoid possible vibration.
Ball valves should be installed in the supply and
return lines for unit isolation and unit water flow
balancing.

ELECTRICAL

Refer to electrical component box layout.
(Figure#10)
WARNING: Field wiring must comply
with local and national electric codes.
WARNING: Power to the unit must be
within the operating voltage range
indicated on the unit nameplate or on
the performance data sheet.
WARNING: Operation of unit on
improper line voltage or with excessive
phase imbalance will be hazardous to
the unit, constitutes abuse and may
void the warranty.
Properly sized fuses or HACR circuit breakers must
be installed for branch circuit protection. See unit
nameplate for maximum fuse or breaker size.
The unit is provided with a concentric knock-out
for attaching common trade sizes of conduit, route
power supply wiring through this opening. Always
connect the ground lead to the grounding lug
provided in the control box and power leads to the
line side of compressor contactor as indicated on
the wiring diagrams..
NOTE: Units supplied with internal electric heat
require two (2) separate power supplies:
1) Unit compressor
2) Electric Heat, blower motor and control
circuit.
NOTE: Refer to the ELECTRIC HEATER
PACKAGE OPTION section and Figure # 11 for
wiring diagrams. See data plate for minimum
circuit ampacities and maximum fuse/breaker
sizing.
Subject to change without prior notice
EP Series
EP Series